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Gongenyama Formation Huzioka, 1967
- Depth of water: Abyssal (Foraminifera)
- Sedimentary facies: Still water (Foraminifera)
- Lithofacies: Mudstone
- Lithofacies (Minor): Silty tuff, Acidic tuff, Tuffaceous sandstone, Conglomerate, Glauconite
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Mount Gongen - Fukunomata creek - Komanakase pass, Yurihonjo city, Akita pref.
- Fossils: Silicified wood
- Fossils (Shellfishes): Arca sp., Chlamys kaneharai murayamai, Clinocardium sp., Conus sp., Dentalium yokoyamai, Dosinia kaneharai, Macoma sp., Mizuhopecten kimurai, Mizuhopecten yamasakii, Paphia sp., Placopecten nomurai, Turritella sp., Venericardia siogamensis, Venerupis sp.
- Fossils (Foraminifera): Alabamia jponica, Ammodiscus spp., Ammonia sp., Amphycorina sp., Anomalina glabrata, Bathysiphon spp., Biloculinella globula, Braeglobobulimina kamedoensis, Buccella sp., Bulimina kamedaensis, Bulimina cf. nipponica, Bulimina striata, Cancris spp., Cassidulina cf. narcrossi, Cassidulina pacifica, Chilostomella cf. ovoides, Cibicides pseudoungerianus, Cibicides cf. reflugens, Cibicides ungerianus, Coesella schenckii, Cribrostomoides cf. subglobosum, Cyclammina cancellata, Cyclammina ezoensis, Cyclammina japonica, Cyclammina pusilla, Dentalina sp., Echigoina sp., Elphidium spp., Eponides cf. umbonatus, Epistominella cf. naraensis, Epistominella pulchella, Fissularia spp., Fissulina sp., Fursenkoina mexicana, Glabratella spp., Glandulina spp., Globigerina bulloides, Globigerina imcompta, Globigerina pachyderma, Globigerina woodi, Globigerinoides spp., Globobulimina auriculata, Globoquadrina altispira, Globoquadrina conglomerata, Globoquadrina dutertrei, Globorotalia mayeri, Globorotalia peripheroacuta, Globorotalia peripheroronda, Globorotalia praescitula, Globorotalia praemenardii, Globorotalia scitula, Goesella sp., Gyroidina orbicularis, Gyroidinoides sordani, Haplophragmoides spp., Hauelina sp., Hopkinsina kamedaensis, Hopkinsina cf. shinboi, Islanfiella cf. margareta, Lagena sp., Lenticulina sp., Lingulina sp., Martinottiella communis, Melonis nicobarense, Melonis pompilioides, Miliammina echigoensis, Miliolinella sp., Multifidella nodulosa, Nodosaria longiscata, Nonion cf. labradoricum, Nonionella hanzawai, Nonionella miocenica, Nonionellina labradoricum, Oolina sp., Orbulina suturalis, Orbulina universa, Planulina nipponica, Planulina wuallerstorfi, Plectofrondicularia sp., Pleurostomella brevis, Polymorphina sp., Praeglobobulimina cf. pupoides, Pseudoglandulina sp., Pseudononion cf. japonica, Pullenia apertula, Pullenia bulloides, Pullenia quinqueloba, Pullenia salisburyi, Pyrgo spp., Quinqueloculina spp., Rectobolivina sp., Rosalia sp., Saccammina sp., Saracenaria sp., Sigmoilopsis schlumbergii, Sphaeroidina cf. compacta, Sphaeroidina japonica, Spirosigmoilinella compressa, Staintorthia spp., Stilostomella lepicula, Textularia sp., Tosaia sp., Trifarina bradyi, Triloculina tricarinata, Uvigerina akitaensis, Uvigerina proboscidea, Valvulineria cf. sadonica
- Nishikawa et al. (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.75-85 DOI
- Ozawa et al. (1977) Geology of the Honjo District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 54p. (in Japanese with English abstract 4p.)
- Huzioka et al. (1976) Geology of the Ugo-Wada District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 65p. (in Japanese with English abstract 5p.)